Definition: Given a 'poster' sentence and a corresponding 'response' (often, from Facebook or Reddit)classify the sentiment of the given response into four categories: 1) Positive, 2) Negative, 3) Neutral, and 4) Mixed if it contains both positive and negative.
Input: Poster: From ABC World News Tonight with David Muir:  Responser: So glad you posted this-- had to work late last night and missed the news!

Positive